I have all of them I do think they all have great aspects and angles, Sleeping Like a Baby is an excellent book if you are having sleep worries or if you want to prepare for your baby, 100 Ways To Calm The Crying has so many great ideas to help soothe a bub which you are bound to get many great ideas from, (I got heaps!) and Parenting by Heart is great for a mum's confidence. I can't choose!!! I suppose choose which is most relevant to your situation or the thing that pulls at your heartstrings the most